| 摘要 |
A bow and arrow sighting device for attachment to the bow and comprised of a range finder of the type having a manually rotatable range adjustment wheel which in one embodiment is coupled by gears to a cylindrical cam in operative engagement with a cam follower mechanism which moves a sighting bead element in synchronism with the angular displacement of the range finder range adjustment wheel so that when the range is found with the adjustment wheel the sighting element will be at the proper archer aiming position for arrow trajectory to the target. The one embodiment incorporates a cylindrical cam in operative engagement with the cam follower mechanism. A second embodiment incorporates a sighting glass in place of the sighting bead element and a parallelogram type lever structure is incorporated in the cam follower mechanism for maintaining the sighting glass in proper axis orientation as well as proper archer aiming position for arrow trajectory to the target. A third embodiment incorporates a single plane cam in operative engagement with the cam follower mechanism. And a fourth embodiment incorporates a single plane cam and a sighting bead carried on a sight adjustment arm mounted to rotate about a common axis on the same shaft with the range adjustment wheel.
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